Latest Development in Radiometric International Standards

International standards for radiometry provide essential guidelines and frameworks that ensure consistency, accuracy, and reliability in the measurement of solar radiation and associated parameters. These standards are vital for solar energy applications, climate research, and studies on weathering and durability. The National Renewable Energy Laboratory (NREL) has taken a leading role in various international subcommittees, including the ISO/TC180 SC1 Climate – Measurement and Data and the ASTM G03.09 Radiometry subcommittee. Recently, NREL and its partners have been actively involved in updating and developing multiple standards to incorporate the latest advancements in knowledge, science, and technology. This paper outlines some key aspects of these updates and their practical applications.